# "+=","*="会改变原数组的值，不会创建新数组
import numpy as np
a= np.arange(3,8)
b = np.arange(1,6)
print('a=',a)
print("b=",b)
print("a+=b:")
a+=b
print(a)
print("b*=3:")
b*=3
print(b)